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有关于lora调制灵敏度的相关问题 #3

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too-difficult-to-study opened this issue Apr 16, 2024 · 3 comments
Open

有关于lora调制灵敏度的相关问题 #3

too-difficult-to-study opened this issue Apr 16, 2024 · 3 comments

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@too-difficult-to-study
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请问老师是否了解计算lora接收机灵敏度中最低信噪比是如何得来的?

@jkadbear
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jkadbear commented Apr 16, 2024

在SX1301的Datasheet(https://www.mouser.com/datasheet/2/761/sx1301-1523429.pdf)3.11节提到“Sensitivities are given for 32 bytes payload, 10% PER”。所以你需要计算一个32字节的数据包在LoRa通信下发生10%接收错误时的信噪比,你可以先根据“From Demodulation to Decoding: Toward Complete LoRa PHY Understanding and Implementation”的公式(19)计算单个符号的接收错误率(Symbol Error Rate),再计算出Bit Error Rate和Packet Error Rate。

@too-difficult-to-study
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too-difficult-to-study commented Apr 17, 2024 via email

@jkadbear
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"所以我想请教lora的长传输时间换取了什么呢"=>"我仅了解到他的灵敏度是通过更长的传输时间换取的",你已经回答了,换来了高灵敏度。至于如何换取,就是牺牲了速率。chirp调制只是更抗单频干扰。

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